Every couple I have met have been very loving towards each other and stable in their relationship. But, enjoy the company of a third man to help provide something extra to their sexual relationship. I always feel honoured that they have asked me to join them for sex and I do my best to fit in with their needs. But, I also have to buy into what they are looking for. Sometimes, the only way to do that is to meet up and suck it and see, if you pardon the pun. It can take several meetings to develop empathy with a couple and smooth out any awkwardness between us.